Woodworking



March 6, 1945. R. R. ROHL WOODWORKING Filed Aug. 6, 1941 s Sheets-Shet 1 March 6, 1945.

R. R. ROHL WOODWORKING Filed Aug. 6. 1941 3 Sheets- Sheet 2 March 6, 1945. I RQHL 2,370,918-

WOODWORKING I Filed Aug. 6, 1941 3 Sheets-Sheet 3 Qwqcmtom Bob'erZR. Rah],

zmxzzw" Patented Mar. 6, 1945 WOODWORKING Robert R. Rohl, Menasha, Wis., assignor of onehalf to Norman E. Brokaw, Sr., Appleton, Wis.

Application August 6, 1941, Serial No. 405,714 3 Claims. (01. 142 -53) My invention relates to woodworking and more particularly to a method and means whereby stock or work-pieces are prepared and held upon turning lathes.

In the type of wood turning lathe wherein the stock or work-piece is supported at one end by a screw chuck and a traveling cutter is shiftably longitudinally mounted on the stock for reducing the diameter of the same, at least one severing knife is employed to sever the stock adjacent the cutter when the latter has completed its'reducing operation. The severing knife is disposed in proximity to the distal end face of the cutter with respect to the chuck. The chuck is fashioned with a head provided with internal screw threads which engage and secure the end of the stock to the chuck, the stock being usually of a .square configuration in cross section. The head of the chuck being of a materially greater diameter than the stock precludes admittance of the chuck within the cutter, thus when the stock is severed, that portion of the stock remaining within the cutter is wasted.

Inasmuch as this wasted stock constitutes an important item in manufacture from an economic standpoint, it is desirable that the amount; of waste be materially reduced. It is therefore one of the objects of my invention to provide means whereby the entire end of the stock secured to the chuck may be disposed within the cutterthereby appreciably reducing the amount of waste stock.

Another object of my invention is to provide a chuck so constructed and arranged as to extend an appreciable distance within the cutter thereby appreciably reducing the amount of waste stock.

A further object of my invention is to provide means for conditioning the end of the stock in a manner that the stock may be effectively gripped and secured to a chuck capable of extending into the cutter.

A still further object of my invention is to provide a method for conditioning the ends of workpieces or stock in a manner that the same may be secured to a chuck capable of extending into pattern.

An important object of my invention is to provide means of the character described which is simple in construction, durable in use, efiicient in operation and economical in manufacture.

' With the above and other objects in view, as will hereinafter appear, the invention consists in the combination, and arrangement of parts hereinafter set forth and illustrated in the accomthe cutter for forming the stock into a desired panying drawings, from which the several features of the invention and the advantages at tained thereby will be readily understood by those skilled in the art.

Referring tothe drawings wherein like reference characters designate like parts throughout the several views:

Figure 1 is a side elevation, partly in section,-

of the centering or drilling device.

' Figure 2 is a vertical sectional view ofthe drilling device and illustrating certain of the parts in a different position with respect to Figure 1.

Figure 3 is a front elevation of the centering device.

Figure 4 is a sectional view 4-4 of Figure 1.

Figure 5 is a side elevation of the chuck in assembled relation with certain parts of the lathe.

Figure 6 is a. vertical sectional view of the chuck and certain of the parts of the lathe.

Figure 7 is a front end elevation of the chuck.

Figure 8 is a detail perspective view of one end ofa work-piece or stock. I

In practising my invention, as illustrated in the drawings, I employ a pair of cooperating units constituting a chuck and a centering or drilling device 5 and 6 respectively. As disclosedin Figures 1 to 4 inclusive, the device 6 comprises a shaft 1 provided at its rear end with a sleeve 8 in which is fixed thereto, by means of a set screw 9, a drive shaft. in of a motor II or other suitable source of power for effecting rotation of the shaft I. I

The front end of the shaft 1 is formed with socket or 'cul-de-sac l2 inwhich is disposed the shank l3 of a dril l4. detachably secured within the socket I2 by means of a radially disposed set screw l4 threadedly carried by the shaft 1 as clearly illustrated in Figure 2. The front end of the 'drill is provided with a bit 16 extending forwardly from a collar H, the latter being interposed between the bit and shank and ngaging the front radial face of the shank 1. to drill a conical-shaped opening I8 into the end face of a work piece or stock 19 when the latter is presented to the drill in a manner hereinafter more fully disclosed.

Mounted on the shaft. 1 for relative rotation therewith, is a sleeve 20 having its rear end. formed with a collar 2| disposed in spaced revlation with, a collar 22 formed on the front end taken on the line.

The shank of the drill is The bit I6 is of a configuration blies 23, the latter having interposed therebetween a coil spring 24 engaging the opposed faces of the assemblies 23 and serving to urge the sleeve 20 away from the sleeve 8.

The front end of the sleeve 20 -is fashioned with a forwardly extending frust'um shaped skirt 25 and with the rear end of said skirt coacting with the sleeve to define an interior shoulder or abutment 26 circumferentially dise posed about the shaft I. v

The front end of the shaft 1' is formed with a collar 2'! coacting with the shoulder 26 to limit.

the outward movement of the sleeve 20 by the operation of the chuck, assuming that thesame is connected to the end of the stock as heretodesired diameter.

spring 24. The collar 2! is fashioned with a slot in which is disposed a longitudinally"extending bar 28 adjustably secured to the collar 2| by fore described and as illustrated in Figure 5, the

head 45 is advanced about the stock and toward the spindle 38, thus, reducing the stock to a Due to the fact that the chuck 5, prejacent the collar 37, is of a lesser diameter than the reduced diameter of the stock, the head 45will be advanced over an appreciable portion of the chuck thereby enabling the. stock to be severed' at a point inclose proximity tothe front end of the stud 32, thus materially reducing the amount of waste stock.

-As illustrated in the drawings, the: inner'circumferential faces of the teeth 40 are tapered to preclude splitting of the stock when the stud is advanced into the'opening l8. 7

the front radial face of the collar 22 whereby to limit the movement of the sleeve toward'the sleeve 8, I I i The sleeve 213 is formed witha radially ex: tending lubricant opening 3|, whereby a suitable lubricant, for instance, oil, may be introduced about the shaft 1 for lubricating the. same during rotation of said shaft within the sleeve 20:

When the collar 2''! is in engagement with the as clearly-illustratedlin Fligure'2.vvv When the end of the stock is thus drilled, it is removedfromthe.

Without further elaboration the foregoing will so fully explain the invention that others may, by applying current knowledge, readily adapt the same for use under variousconditions of service.

skirt toward the drill Is to effect the drilling the conical-shaped opening [8 in the end of the stock.

skirt andsecured to the-;.ch-uck,5 ashereinafter I more fully described.

The chuck 5 comprises: a'cylindriform member formed with a centrally disposed andlongitudinally extending bore 35. The rear end of thejchuck '5 is formed'with an'interiorlygthreaded collar 3?" connected tothegspin-dle 38. of a lathe 39. The front face: of the chuck 5is fashioned about its-periphery; with a quaternary of stock penetrating; orfengaging teeth or; spurs .58 while the bore 36, postjacent s'aid'front face, ,is pro,-

vided' with threads for .threadedlyv receivingtherein the threaded shank M of a stud-42;.the latter being provided, at its front end, with. a

conical-shaped screw threaded head 43-for dis-1" l8 of the stock 19- chuck.

As illustrated in Figures 5 and 6, the lathe is provided with theusual cutter-4 2' comprising a head-45in which is disposedia'forming knife 46' for reducing the stock to' adesired diameter. Adjacent the front or distal end face with respec-t to the spindle 38; there is provided the usual severing knife 4? for severing, thestock into desired lengths in the customaryv manner.

Prejacent thev collar 3?, the chuck ,5 is of a lesser diameter than the openingv in the head 45 through which the stock'lfl, is advancedL- In the -Moreover, it is not indispensable that all the features of the invention be used conjointly since they. may be employed advantageously in various combinations and sub-combinations. f It isobvious that the inventionis not confined to the herein described u'setherefor as it may be utilized for any purpose to whichv-it is adaptable. It is therefore to be understood that theinvention' is not. limited to the specific construction as illustrated and described as the same is only illustrative of the principles of. operation,.which are capable of extended application in various forms,-

and that the invention comprehends all construe tionwithin the scope of the appended claims.

i on the opposite. end of said chuckfor engaging the end face of a workpiece for effecting drivirng relation with said work-piece and for securing. saidwork-piece in fixed relation with said chuck, said. chuck being of a diameter to permit said opposite end to extend through said opening and 2'. In combination, a cutter head ofthetype provided with awork-piece receiving opening and i a. forming knife extending therein, for reducing stock in fixed and centralized relation with the the diameter of a-work-piece upon-advance of the, work-piece through said opening, a chuck having one end adaptedtovbe securedtofthe end of a spindle for unitary. rotation therewitli, the opposite end of said chuck beingformed onits face} 7 with teeth adaptedto. engage the end face of a work-piece for effecting driving relation with said; work-piece, anameans carried by saidopposite end for. disposal within said end face of said, work-piece for securing said" Work-piecein fixed relation'withsaid chuck, saidchuck being of adiameter to permitsaid oppfisite end. to extend;

,through said opening and beyond said knife-as,

the work-piece is advancedthrough saidopen'ihg andb yond the, knife; Y e

' 3. In. combination, a-cutterhead of the, type provided-with a work-piece receiving,opening and a forming knife extending therein for. reducing thediameter'of aworkpieceupon advance. of the, workpiece throughsaid opening, .a chuck having one. end adapted. to be, secured to the; end of a head of the; type Work-piece in fixed relation With'said chuck, said chuck being of a diameter to permit said opposite end to extend through said opening and beyond said knife as the work-piece is advanced through 5 said opening and beyond the knife. I

ROBERT R. ROI-IL. 

